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arXiv quant-ph/9911035quant-ph
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利用两个相干态及其叠加实现量子密钥分发

Quantum Key Distribution using Two Coherent States of Light and their Superposition

Y. Nambu, A. Tomita, Y. Chiba-Kohno, K. Nakamura

摘要:

量子力学的互补性确保了Bennard和Bennet在1984年(BB84)报告的密钥分配方案的安全性,但并不禁止使用多光子作为信号载体。我们描述了一种新的BB84方案,其中两个近正交的相干态携带的密钥,这些状态(猫态)的叠加保护通信信道的窃听。当通过零差检测测量某个正交分量时,可以根据结果分布中干涉条纹的可见性来确定对窃听者的信息泄漏。信道损耗和检测器效率的影响进行了讨论。

英文摘要:

Quantum mechanical complementarity ensures the security of the key-distribution scheme reported by Brassard and Bennet in 1984 (BB84), but does not prohibit use of multi-photons as a signal carrier. We describe a novel BB84 scheme in which two nearly orthogonal coherent states carry the key, and the superposition of these states (cat states) protects the communication channel from eavesdropping. Information leakage to eavesdroppers can be determined from the visibility of the interferential fringes in the distribution of the outcome when a certain quadrature component is measured through homodyne detection. The effect of channel loss and detector inefficiency is discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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